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Ultrafast Molecular Transport on Carbon Surfaces: The Diffusion of Ammonia on Graphite
- Source :
- Carbon 126, 23 (2018)
- Publication Year :
- 2017
-
Abstract
- We present a combined experimental and theoretical study of the self-diffusion of ammonia on exfoliated graphite. Using neutron time-of-flight spectroscopy we are able to resolve the ultrafast diffusion process of adsorbed ammonia, NH$_3$, on graphite. Together with van der Waals corrected density functional theory calculations we show that the diffusion of NH$_3$ follows a hopping motion on a weakly corrugated potential energy surface with an activation energy of about 4 meV which is particularly low for this type of diffusive motion. The hopping motion includes further a significant number of long jumps and the diffusion constant of ammonia adsorbed on graphite is determined with $D=3.9 \cdot 10^{-8}~\mbox{m}^2 /\mbox{s}$ at 94 K.
- Subjects :
- Condensed Matter - Materials Science
Subjects
Details
- Database :
- arXiv
- Journal :
- Carbon 126, 23 (2018)
- Publication Type :
- Report
- Accession number :
- edsarx.1710.00740
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1016/j.carbon.2017.09.104